// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package strconv

import "exp/mem"

// ParseBool returns the boolean value represented by the string.
// It accepts 1, t, T, TRUE, true, True, 0, f, F, FALSE, false, False.
// Any other value returns an error.
func ParseBool(str mem.RO) (value bool, err error) {
	switch {
	case str.EqualString("1"), str.EqualString("t"), str.EqualString("T"), str.EqualString("true"), str.EqualString("TRUE"), str.EqualString("True"):
		return true, nil
	case str.EqualString("0"), str.EqualString("f"), str.EqualString("F"), str.EqualString("false"), str.EqualString("FALSE"), str.EqualString("False"):
		return false, nil
	}
	return false, syntaxError("ParseBool", str)
}

// FormatBool returns "true" or "false" according to the value of b
func FormatBool(b bool) string {
	if b {
		return "true"
	}
	return "false"
}

// AppendBool appends "true" or "false", according to the value of b,
// to dst and returns the extended buffer.
func AppendBool(dst []byte, b bool) []byte {
	if b {
		return append(dst, "true"...)
	}
	return append(dst, "false"...)
}
